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Comment by soulrisk

Another great looking gem stack a few of these and executioner would be great for pvp and also pve depending on other things

Comment by BlackMojo

As long as armor penetration mechanics stay the same in wrath of the lich king, the more you stack, the more effect it will have. Also, the less armor your target has, the more effect penetration will have. This will be especially useful for melee once hit rating/expertise caps have been reached, or for pvp.

Comment by Supercool

Roughly equivalent to +20 Str for a warrior, and better when stacked, but with a diminished effect once you remove essentially all armor from clothies.

Finding the right balance will be interesting, and give theorycrafters something to do.

Comment by Miranger

So many new type of gems will definitely give people alot of headaches trying to figure out whats best until the geeks can run the spreadsheets for us to look over.& i mean geeks in a good term cuz god knows i don't have the time to test theories for hours on end lol

Comment by Yuka2

Hehe ... with the new ratings ppl with alot of armor (druids paladins warriors) are screw'd

Comment by NuSkooler

An attempt to clear up ArP:

Yes, as of WotLK the mechanics have changed slightly: You now receive a ArP rating VS direct "ignore armor".

At level 80, ~15.39 ArP = 1% reduction. That being said, you get ~1.30% armor reduction from this gem.

Certainly it should be easy to see that the closer you get to 100% reduction, the better.

Comment by montypythizzle

This are probably going to sell like hotcakes for melee PvPers.

Comment by Padeus

Where is this gem in particular obtained? Searched everywhere and it doesn't say anywhere.

Comment by m3ndo

Especially useful for feral druids, who can very easily exp and hit cap from gear. ArP is CURRENTLY stacking better than agility, and theorycrafting is reporting that you can move past the ArP cap and actually get a negative armor effect. The more you have, the better it becomes.

Comment by igiwarcraft

Armor penetration is a good stat for meele DPS classes as rogues, death knights and Druids. To roughly clarify the benefit it rewards to a feral druid:

At about 200-300 armor penetration (arp), arp becomes a better stat than agility. What this means is, when you reach around 200 armor penetration from gear, you should start socketing armor penetration instead of agility. That should slightly improve your dps.

Furthermore, the best DPS trinket you can get is Mjolnir Runestone OR Grim toll. Going over 100% arp is a waste. So, there is a value called "softcap" for armor penetration. It is the value of armor penetration which grants 100% armor penetration if your Grim Toll/Mjolnir Runestone procs.

Taken from EJ: (tooltip is wrong, the procc is 665 ArP)

Wearing both trinkets is quite useless since they have a significant shared uptime and then there would be ArP wasted (assuming you've got some ArP on your gear). The goal is, to reach the ArP soft-cap. Soft Cap means: you have exactly 100% Armor Ignore when your trinket proccs.